How do astronauts cry in the universe?

Astronaut Chris Hadfield simulated experiments showing the impact of micro gravity environment when crying.

Video: Describe how astronauts cry in the universe?

Chris Hadfield said he couldn't cry on demand, but he did the experiment by putting water on his eyes and watching what happened.

" You can see that it just forms a water balloon on my eyes. So if you cry, a larger water ball will stay on your eye until it overflows your nose and the other eye. You can crying in the universe, but the big difference is that tears won't fall , "Hadfield said.